Melatonin ist kein Schlafmittel – so wirkt es wirklich

Melatonin Is Not a Sleeping Pill – This Is How It Really Works

Sleep & Recovery · approx. 6 min. read

Melatonin is probably the most misunderstood sleep aid on the drugstore shelf. It's often treated like a sleeping pill – take more to "knock out" faster. That's precisely the misconception that tends to weaken, rather than strengthen, its effect.

What happens in the body

Melatonin is not a sedative, but a time signal. The body's own production begins to rise in the dark and tells the body: The biological night is beginning. Bright light – especially blue light from screens – suppresses this release, which explains why late scrolling in bed actively counteracts your own melatonin levels.

Timing: When matters more than how much

The crucial factor with melatonin is not "how much," but "when":

  • Most effective: shortly before your desired bedtime, usually 30–60 minutes prior.
  • Taken too early it tends to shift the internal clock without making you acutely tired – which is why it's deliberately used for jet lag at the new bedtime in the destination, not immediately after landing.
  • In a dark, cool room. Melatonin works with darkness, not against bright light – if you take it and then stare at your phone for another hour, you're working against its intended effect.

How much is appropriate?

Here, the study findings surprise most people: A 2024 dose-response analysis of many controlled studies found that even low doses in the range of 1–2 mg, when timed correctly, account for most of the effect on sleep onset. Higher doses – such as those found in many over-the-counter products from the USA with 5, 10, or even 20 mg – did not proportionally improve the result in the analysis, but were associated with more side effects like daytime drowsiness. The "more is better" logic demonstrably does not work with melatonin.

How to get the most out of it

  • As a spray into the oral mucosa, the active ingredient is absorbed faster than through the gastrointestinal tract – practical if you're planning short-term instead of an hour in advance.
  • Do not combine with alcohol. Both affect sleep architecture, but in opposite ways – alcohol disrupts the restorative deep sleep that melatonin is actually intended to support.
  • Not routinely every night for months, but specifically when needed – for example, when changing time zones or temporarily shifting your rhythm due to shift work.

What additionally supports the effect

  • No screen time for at least 30 minutes before taking it. This is not a minor detail – bright light can actively suppress your body's own melatonin production while you are simultaneously supplementing it.
  • A fixed time. The body responds to regularity; taking melatonin at varying, unpredictable times weakens the training effect on the internal clock.
  • Cool room temperature, as body temperature naturally drops slightly before falling asleep – a room that is too warm works against this.

What it works best for – and what it doesn't

The effect is most reliably shown for prolonged sleep latency and for jet lag after time zone changes. For pure sleep maintenance problems – for those who wake up frequently at night but fall asleep easily – the effect is significantly less clear. Here, looking at sleep hygiene, stress levels, or other causes is more beneficial than a higher melatonin dose.

Who it is particularly relevant for

Melatonin is quickly narrowed down to "people with sleep problems" – yet its actual area of expertise is the internal clock, not sleep itself. This makes it more relevant for some situations than its beauty-and-wellness reputation might suggest:

  • Shift workers whose sleep-wake rhythm is regularly shifted against the natural light-dark cycle.
  • Frequent travelers who cross multiple time zones more often than others.
  • People with irregular weekly schedules – for example, due to highly fluctuating work or study times – where bedtime shifts significantly from day to day.

For all three groups, the same principle applies as described above: used precisely and specifically when needed, not as a daily long-term solution.

Good to know

Anyone who has been sleeping poorly for weeks should not mask this with melatonin permanently, but have the cause clarified.

Relevant products

medi Melatonin Spray provides 1 mg of melatonin per 2 sprays – precisely the low and well-researched amount described in the text, delivered directly via the oral mucosa.

Sources

  • Optimizing the Time and Dose of Melatonin as a Sleep-Promoting Drug: Dose-Response Meta-Analysis, Journal of Pineal Research (2024). Wiley
  • Melatonin for the prevention and treatment of jet lag, Cochrane. cochrane.org

This article is for general information purposes only and does not replace individual medical advice.

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